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The world of Sailor Moon, being so wide and open, is a popular universe for fans to use for crossovers, especially in the RotBTD fandom. The world of Sailor Moon is an ideal location for the Big Four to interact because of a few reasons: the existence of magic is not known, so only to the chosen ones; their powers are based off planets; and they are easily connected since they live in Japan.

In most cases, the Big Four are designed to save Earth from dark forces.

He is widely debated. Because of his ice powers most people associate him with Sailor Mercury, and that ice is a frozen version of water. The powers are Water and Wisdom, which most people think it fits him perfectly.

But, people also believe he should be Sailor Moon instead, because people think he would make a better leader of the group. The powers are Love and Justice, which can be another reason people think it fits him perfectly.

Also people associate him with Tuxedo Mask because of the Jackunzel pairing.

She is mostly associated with Sailor Moon because of the Jackunzel pairing. Both characters have long blonde hair, caring personalities and are underestimated although being strong. They always do what they need to do, if being a little scared in the beginning.

Some people believe that since she doesn't have powers, they would mostly give her fire powers, making her Sailor Mars. But some people like to make her Sailor Moon, because of the Janna pairing. Also, they are both awkward, clumsy and boy crazy.